Blender, it's open source and you don't really need a lot of technical skill to design cool looking shit. Once you learn the basics, Ian Hubert and CGMatter tutorials are great and like two minutes long each

It's uhh, not really a game but it has essentially replaced those games for me when I want to sit down and fuck around making shit, and there's always a ton of youtube tutorials for almost any subject, from post-apocalyptic buildings to grass that looks like ghibli